<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>class</title>
		<script src="https://cdn.jsdelivr.net/npm/vue"></script>
	</head>
	<body>
		<div id="app">
			<p class="big" :class="{active:isActive,'so-bay':isshow}"></p>
		</div>
		<script>
			var vm = new Vue({
				el:'#app',
				data:{
					isActive : true,
					isshow:true
				}
			})
		</script>
	</body>
</html>
